215975 has 12 divisors (see below), whose sum is σ = 274536. Its totient is φ = 168480.

The previous prime is 215959. The next prime is 215981. The reversal of 215975 is 579512.

It is not a de Polignac number, because 215975 - 2⁴ = 215959 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1244 + ... + 1406.

It is an arithmetic number, because the mean of its divisors is an integer number (22878).

2²¹⁵⁹⁷⁵ is an apocalyptic number.

215975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215975 is a deficient number, since it is larger than the sum of its proper divisors (58561).

215975 is a wasteful number, since it uses less digits than its factorization.

215975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 221 counting only the distinct ones).

The product of its digits is 3150, while the sum is 29.

The square root of 215975 is about 464.7311050489. The cubic root of 215975 is about 59.9976850959.

The spelling of 215975 in words is "two hundred fifteen thousand, nine hundred seventy-five".